CVE-2009-1897 Null dereference in n/a

What is CVE-2009-1897?

CVE-2009-1897 is a medium-severity vulnerability in Linux kernel, published on 20 Jul 2009. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The tun_chr_poll function in drivers/net/tun.c in the tun subsystem in the Linux kernel 2.6.30 and 2.6.30.1, when the -fno-delete-null-pointer-checks gcc option is omitted, allows local users to gain privileges via vectors involving a NULL pointer dereference and an mmap of /dev/net/tun, a different vulnerability than CVE-2009-1894.

Weakness: CWE-119

Which versions are affected by CVE-2009-1897?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2009-1897?

No fix has been published for CVE-2009-1897 yet. Limit exposure of the affected software until one is available.

Is CVE-2009-1897 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2009-1897 exists.

Public exploit code: 2 Exploit-DB entries.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-7g2j-wp9p-8rcr.